• Title/Summary/Keyword: Automotive radar

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Radar Image Extraction Scheme for FMCW Radar-Based Human Motion Indication (FMCW 레이다 기반 휴먼 모션 인지용 레이다 영상 추출 기법)

  • Hyun, Eugin;Jin, Young-Seok;Jeon, Hyeong-Cheol
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.29 no.6
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    • pp.411-414
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    • 2018
  • In this paper, we propose a radar image extraction scheme for frequency modulated continuous wave radar-based human motion indication. We extracted three-dimensional(3D) range-velocity-angle spectra and generated three micro-profile images by compressing the 3D images in all three directions in every frame. Furthermore, we used body echo suppression to make use of the weak reelection such as in hands and arms. By applying the complete images to classifiers, various human motions can be indicated.

A 77 GHz mHEMT MMIC Chip Set for Automotive Radar Systems

  • Kang, Dong-Min;Hong, Ju-Yeon;Shim, Jae-Yeob;Lee, Jin-Hee;Yoon, Hyung-Sup;Lee, Kyung-Ho
    • ETRI Journal
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    • v.27 no.2
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    • pp.133-139
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    • 2005
  • A monolithic microwave integrated circuit (MMIC) chip set consisting of a power amplifier, a driver amplifier, and a frequency doubler has been developed for automotive radar systems at 77 GHz. The chip set was fabricated using a 0.15 ${\mu}$ gate-length InGaAs/InAlAs/GaAs metamorphic high electron mobility transistor (mHEMT) process based on a 4-inch substrate. The power amplifier demonstrated a measured small signal gain of over 20 dB from 76 to 77 GHz with 15.5 dBm output power. The chip size is 2mm${\times}$ 2mm. The driver amplifier exhibited a gain of 23 dB over a 76 to 77 GHz band with an output power of 13 dBm. The chip size is 2.1mm${\times}$ 2mm. The frequency doubler achieved an output power of -6 dBm at 76.5 GHz with a conversion gain of -16 dB for an input power of 10 dBm and a 38.25 GHz input frequency. The chip size is 1.2mm ${\times}$ 1.2mm. This MMIC chip set is suitable for the 77 GHz automotive radar systems and related applications in a W-band.

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High Resolution Forward-Looking Collision Avoidance Automotive Radar Using Stepped-Frequency Pulsed-Doppler(SFPD) Technique (계단 주파수 변조된 펄스 도플러 기법을 이용한 고해상도 전방 충돌 회피용 차량 레이다 성능 분석)

  • Woo, Sung-Chul;Kwag, Young-Kil
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.8
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    • pp.784-790
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    • 2009
  • A forward-looking automotive radar typically utilizes the frequency modulated continuous wave(FMCW) or pulsed-Doppler waveform for the Information acquisition of the target range and velocity. In order to obtain the high resolution target information, however, a narrow pulse width and wide bandwidth are inherently required, thus resulting in high peak power and high speed digital converter processing. In this paper, a stepped-frequency pulsed-Doppler(SFPD) waveform algorithm is proposed for high resolution forward looking automotive radar application. The performance of the proposed SFPD waveform technique is analyzed and compared with the conventional FMCW and PD method. Since this technique can be used for the high resolution target imaging with arbitrary range and Doppler resolution, it is expected to be useful In automotive radar target classification for the precision collision avoidance applications in the future.

Precipitation Information Retrieval Method Using Automotive Radar Data (차량레이더 자료 기반 강수정보 추정 기법)

  • Jang, Bong-Joo;Lim, Sanghun
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.40 no.3
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    • pp.265-271
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    • 2020
  • Automotive radar that is one of the most important equipment in high-tech vehicles, is commonly used to detect the speed and range of objects such as cars. In this paper, in addition to objects detection, a method of retrieving precipitation information using the automotive radar data is proposed. The proposed method is based on the fact that the degree of attenuation of the returned radar signal differs depending on the precipitation intensity and the assumption that the distribution of precipitation is constant in short spatial and temporal observation. The purpose of this paper is to assesses the possibility of retrieving precipitation information using a vehicle radar. To verify the feasibility of the proposed method during actual driving, a method of estimating precipitation information for each time segment of various precipitation events was applied. From the results of driving field experiments, it was found that the proposed method is suitable for estimating precipitation information in various rainfall types.

Design and Implementation of DSP module for Automotive Radar System using FMCW (FMCW방식의 자동차 레이더 신호처리부 설계 및 구현)

  • OH Woo-Jin
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.12
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    • pp.77-84
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    • 2004
  • We design and implement the DSP module for automotive radar using FMCW. The designed parameters are based on 77GHz FMCW radar, and show the resolution of 0.4m and 0.67km/h in distance and velocity, respectively. For detecting multiple targets, we discuss the relationship between fb's and targets. In addition, we show that the detection of multiple targets is very simple when the range of $f_r$ is sufficiently larger than that of $f_b$. In the front of ADC, the 2nd order differentiator is applied for reducing the effects of path-loss so that the ADC bits are reduced to 8 bits. The designed block is simulated in Matlab and implemented with DSP and micro-processor.

An Application of Computer Vision and Laser Radar to a Collision Warning System (자동차 추돌경보 시스템 개발을 위한 컴퓨터 비젼과 레이저 레이다의 응용)

  • 이준웅
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.5
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    • pp.258-267
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    • 1999
  • An intelligent safety vehicle(ISV) should have an ability to predict the possibility of an accident and help a driver avoid the accident in advance. The basic function of the ISV is to alert the driver by warning when the collision is to occur. For this purpose, the ISV has to function efficiently in sensing the environmental context. While image processing provides lane information, laser radar senses road obstacles including vehicles. By applying a simple clustering algorithm to radar signals, it is possible to obtain the vehicle information. Consequently, we can identify the existence of the vehicle of interest on my lane. The reliability of the sensing algorithm is evaluated by running on the highway with a test vehicle.

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UWB Automobile Short Range Radar Receivers Performance In a Log-Normal Clutter Background (Log-Normal Clutter 환경에서 차량용 UWB 단거리 레이더 수신기의 성능분석)

  • Kumaravelu, Nandeeshkumar;Ko, Seok-Jun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.48 no.9
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    • pp.59-64
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    • 2011
  • Ultra wideband radars attract considerable attention as a short range automotive radar because of its high range resolution. Radar signal reflected from a target often contains unwanted echoes called as clutter, so the detection of target is difficult due to clutter echoes. Therefore, it is important to investigate the radar detector for better detecting from the reflected signals. In this paper, the optimal detector is obtained for various mean and variance value in log-normal clutter environment. The types of non-coherent detectors used are square law detector, linear detector, and logarithmic detector. The performances of detectors are compared in log normal clutter environment and the suitable detector is determined for automotive short range radar application.

Interference Mitigation by High-Resolution Frequency Estimation Method for Automotive Radar Systems (고해상도 주파수 추정 기법을 통한 차량용 레이더 시스템의 간섭 완화에 관한 연구)

  • Lee, Han-Byul;Choi, Jung-Hwan;Lee, Jong-Ho;Kim, Yong-Hwa;Kim, YoungJoon;Kim, Seong-Cheol
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.41 no.2
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    • pp.254-262
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    • 2016
  • With the increased demand for automotive radar systems, mutual interference between vehicles has become a crucial issue that must be resolved to ensure better automotive safety. Mutual interference between frequency modulated continuous waveform (FMCW) radar system appears in the form of increased noise levels in the frequency domain and results in a failure to separate the target object from interferers. The traditional fast fourier transform (FFT) algorithm, which is used to estimate the beat frequency, is vulnerable in interference-limited automotive radar environments. In order to overcome this drawback, we propose a high-resolution frequency estimation technique for use in interference environments. To verify the performance of the proposed algorithms, a 77GHz FMCW radar system is considered. The proposed method employs a high-resolution algorithm, specially the multiple signal classification and estimation of signal parameters via rotational invariance techniques, which are able to estimate beat frequency accurately.

Design of 24 GHz Radar with Subspace-Based Digital Beam Forming for ACC Stop-and-Go System

  • Jeong, Seong-Hee;Oh, Jun-Nam;Lee, Kwae-Hi
    • ETRI Journal
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    • v.32 no.5
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    • pp.827-830
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    • 2010
  • For an adaptive cruise control (ACC) stop-and-go system in automotive applications, three radar sensors are needed because two 24 GHz short range radars are used for object detection in an adjacent lane, and one 77 GHz long-range radar is used for object detection in the center lane. In this letter, we propose a single sensor-based 24 GHz radar with a detection capability of up to 150 m and ${\pm}30^{\circ}$ for an ACC stop-and-go system. The developed radar is highly integrated with a high gain patch antenna, four channel receivers with GaAs RF ICs, and back-end processing board with subspace based digital beam forming algorithm.

Design of 77-GHz Automotive Radar Frontend Modules (77 GHz 대역 차량용 레이더의 프론트 엔드 모듈 설계)

  • Park, Sangwook;Kwon, Manseok;Kam, Dong Gun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.4
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    • pp.487-490
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    • 2014
  • This paper describes a design of an automotive radar frontend module with taking care of the routing of 77-GHz signals on a printed circuit board including wire-bond and waveguide transitions.